What is the VPN icon in the menu bar? [closed]

macos vpn menu-bar

There's a few people think it's an RSA SecurID tag:

http://osx.tribe.net/thread/1ba4a52c-807c-4c6f-bf73-5561bcc208ed

http://www.mactalk.com.au/11/58913-what-does-vpn-menubar-icon-mean.html

Don't know if I buy it though.

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